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Weekly Market Snapshot | September 25, 2026

We’ve seen a meaningful divergence on display in the stock market this month as the global bond selloff has pushed yields sharply higher.

In the past couple of weeks, we’ve discussed the drivers behind rising bond yields, and now they’re causing a division among stocks this month.  In the chart below, we see dividend-paying stocks (green) getting hammered (down over 4.5%) as more attractive bond yields will inevitably draw some income-seeking investors from dividend stocks to bonds.  Speaking of bonds (red), they’re down over 2.5% this month as higher yields make almost all existing bonds worth less.

But here’s the big split.  The standard S&P 500 index (blue) remains up almost 1% this month, while the Dow (light blue) and the equal-weight S&P 500 (pink) are both down over 2.5%.

This is because the standard S&P 500 index gives more weight to larger companies.  This is often referred to as the cap-weighted S&P 500, short for capitalization-weighted.  Currently, the 10 largest companies are now almost 40% of the value of the S&P 500 and accounted for 34% of the profits as of May.

https://www.slickcharts.com/sp500

 

“The S&P 500 is not a diversified index anymore; it is dominated by a small number of extraordinarily profitable tech companies.”

https://www.apollo.com/wealth/insights-news/insights/daily-spark/top-10-companies-account-for-34-of-profits-in-the-sp-500

Alternatively, the Dow is not cap-weighted.  Instead, it uses an antiquated methodology I won’t go into here, but it results in just a 17% technology weighting.

Finally, the equal-weight S&P 500 does just what it says – it weights all companies in the S&P 500 equally, about 0.2% each.  This gives the largest 10 companies a weighting of 2% as opposed to nearly 40% in the standard S&P 500, and an overall technology weighting of about 17%, like the Dow.

Despite concerns pushing most stocks lower this month, investors have unsurprisingly been reluctant to sell the 10 stocks responsible for the most concentrated market in history.

 

Have a great weekend.

 

Jack C. Harmon II, CFP®, CIMA

Principal, Harmon Financial Advisors

Registered Principal, Raymond James Financial Services

 

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The S&P 500 is an unmanaged index of 500 widely held stocks that is generally considered representative of the U.S. stock market.

The S&P 500® Equal Weight Index (EWI) is the equal-weight version of the widely used S&P 500. The index includes the same constituents as the capitalization weighted S&P 500, but each company in the S&P 500 EWI is allocated a fixed weight – or 0.2% of the index total at each quarterly rebalance.

The S&P High Yield Dividend Aristocrats® index is designed to measure the performance of companies within the S&P Composite 1500® that have followed a managed-dividends policy of consistently increasing dividends every year for at least 20 years.

The Dow Jones Industrial Average (DJIA), commonly known as “The Dow” is an index representing 30 stocks of companies maintained and reviewed by the editors of the Wall Street Journal.

Bond prices and yields are subject to change based upon market conditions and availability. If bonds are sold prior to maturity, you may receive more or less than your initial investment. There is an inverse relationship between interest rate movements and fixed income prices. Generally, when interest rates rise, fixed income prices fall and when interest rates fall, fixed income prices rise.

U.S. government bonds and Treasury notes are guaranteed by the U.S. government and, if held to maturity, offer a fixed rate of return and guaranteed principal value. U.S. government bonds are issued and guaranteed as to the timely payment of principal and interest by the federal government. Treasury notes are certificates reflecting intermediate-term (2 – 10 years) obligations of the U.S. government.

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